package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.annotation.AutoFill;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Employee;
import com.sky.enumeration.OperationType;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品及其对应的口味
     *
     * @param dishDTO
     */
    @Override
    @Transactional//因为要操作两个表,要保持事务一致性,所以添加@Transactional
    public void save(DishDTO dishDTO) {
        /**
         * 因为dishDto有口味的数据,dish表和dish_flavor口味表是两个表,所以要分开插入数据到表中
         */
        //插入到菜品表中
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);
//        获取insert语句生成的主键值
        Long dishId = dish.getId();
        //插入到口味表中去(n条数据)
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    @Transactional//事务注解
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除--是否存在在售卖的菜品??
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //当前菜品处于售卖中,无法删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否能够删除---是否被套餐关联了???
        List<Long> setmealIds = setmealMapper.getSetmealIdsByDishId(ids);
        if (setmealIds.size() > 0 && setmealIds != null) {
            //当前菜品被套餐关联了,不能删除
            throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
        }
//        //删除菜品中的数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //删除菜品中关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品数据以及口味数据
     *
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long dishId) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(dishId);
        //根据id查询口味数据
        List<DishFlavor> dishFlavor = dishFlavorMapper.getDishFlavor(dishId);
        //将查询到的数据
        // 封装到DishVo
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavor);
        return dishVO;
    }

    /**
     * 更新菜品及其口味数据
     * @param dishDTO
     */
    @Override
    public void updateById(DishDTO dishDTO) {
        //修改菜品数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);
        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品起售、停售
     * @param status
     * @param id
     */
    @Override
    @AutoFill(OperationType.UPDATE)
    public void startOrStop(Integer status, long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }

    /**
     * 根据分类id查询菜品
     *
     * @param categoryId
     */
    @Override
    public List<Dish> getBycategoryId(long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getDishFlavor(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
